A365255 Decimal expansion of Product_{n>=2} cos(Pi/(2*n)).

4, 2, 9, 7, 8, 0, 2, 1, 6, 4, 3, 7, 9, 9, 1, 7, 0, 6, 5, 8, 4, 7, 8, 9, 5, 1, 4, 7, 0, 6, 3, 3, 0, 4, 8, 8, 4, 9, 2, 5, 3, 7, 6, 3, 9, 7, 4, 5, 4, 8, 6, 5, 7, 1, 0, 8, 2, 7, 6, 5, 7, 3, 7, 4, 3, 6, 8, 8, 3, 3, 6, 8, 8, 4, 3, 7, 2, 9, 1, 5, 9, 5, 3, 1, 0

Offset: 0

Author

R. J. Mathar, Aug 29 2023

Keywords

• cons
• nonn

Examples

			0.4297802164379917065847895147063304...
		

Crossrefs

Cf. A085365, A365256.

Programs

PARI

exp(sumpos(n=2, log(cos(Pi/(2*n))))) \\ Michel Marcus, Aug 29 2023

Formula

this* A365256 = A085365.